Yes, the Soviets start to disband their Corps HQs on turns 3 or 4. The Soviets had to dissolve the Corps level of command because too many officers were taken out of service during the purge. There just were not enough trained staff officers to manage the Corps - Army - Front command levels. Later on the Soviets began to reorganize the Corps level - although mostly by changing the divisional structures to manage two brigades and concentrating the attached troops to the Corps level rather than the divisional.